Well, the real catch is that a Walmart+ membership doesn't actually guarantee that you'll be able to make a purchase
You play it when you need to counter their two mana combo card, when you are on the draw or when they are an agro deck with over 25% of their list costing two mana
*One promo card, one deck case, and one deck shield are included in each random pack
So too are other lands that just happen to hit the graveyard a modest amount like Shifting Woodland, Urza's Saga, and creature lands like Raging Ravine
If you fall sufficiently behind or low on life against a RDW you just cannot sensibly play Necro and it winds up being card disadvantage for you
And while we dont exile the creature and cant get rid of Planeswalkers, theres a lot to be said about triggering all our creatures with a removal spell attached